File: /usr/src/linux/drivers/char/amiserial.c
1 /*
2 * linux/drivers/char/amiserial.c
3 *
4 * Serial driver for the amiga builtin port.
5 *
6 * This code was created by taking serial.c version 4.30 from kernel
7 * release 2.3.22, replacing all hardware related stuff with the
8 * corresponding amiga hardware actions, and removing all irrelevant
9 * code. As a consequence, it uses many of the constants and names
10 * associated with the registers and bits of 16550 compatible UARTS -
11 * but only to keep track of status, etc in the state variables. It
12 * was done this was to make it easier to keep the code in line with
13 * (non hardware specific) changes to serial.c.
14 *
15 * The port is registered with the tty driver as minor device 64, and
16 * therefore other ports should should only use 65 upwards.
17 *
18 * Richard Lucock 28/12/99
19 *
20 * Copyright (C) 1991, 1992 Linus Torvalds
21 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
22 * 1998, 1999 Theodore Ts'o
23 *
24 */
25
26 /*
27 * Serial driver configuration section. Here are the various options:
28 *
29 * SERIAL_PARANOIA_CHECK
30 * Check the magic number for the async_structure where
31 * ever possible.
32 */
33
34 #include <linux/config.h>
35 #include <linux/version.h>
36
37 #undef SERIAL_PARANOIA_CHECK
38 #define SERIAL_DO_RESTART
39
40 /* Set of debugging defines */
41
42 #undef SERIAL_DEBUG_INTR
43 #undef SERIAL_DEBUG_OPEN
44 #undef SERIAL_DEBUG_FLOW
45 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46
47 /* Sanity checks */
48
49 #define SERIAL_INLINE
50
51 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
52 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
53 kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
54 #else
55 #define DBG_CNT(s)
56 #endif
57
58 /*
59 * End of serial driver configuration section.
60 */
61
62 #include <linux/module.h>
63
64 #include <linux/types.h>
65 #include <linux/serial.h>
66 #include <linux/serialP.h>
67 #include <linux/serial_reg.h>
68 static char *serial_version = "4.30";
69
70 #include <linux/errno.h>
71 #include <linux/signal.h>
72 #include <linux/sched.h>
73 #include <linux/kernel.h>
74 #include <linux/timer.h>
75 #include <linux/interrupt.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/console.h>
79 #include <linux/major.h>
80 #include <linux/string.h>
81 #include <linux/fcntl.h>
82 #include <linux/ptrace.h>
83 #include <linux/ioport.h>
84 #include <linux/mm.h>
85 #include <linux/slab.h>
86 #include <linux/init.h>
87 #include <linux/delay.h>
88
89 #include <asm/setup.h>
90
91 #include <asm/system.h>
92 #include <asm/io.h>
93 #include <asm/irq.h>
94 #include <asm/bitops.h>
95
96 #include <asm/amigahw.h>
97 #include <asm/amigaints.h>
98
99 #ifdef SERIAL_INLINE
100 #define _INLINE_ inline
101 #endif
102
103 static char *serial_name = "Amiga-builtin serial driver";
104
105 static DECLARE_TASK_QUEUE(tq_serial);
106
107 static struct tty_driver serial_driver, callout_driver;
108 static int serial_refcount;
109
110 /* serial subtype definitions */
111 #ifndef SERIAL_TYPE_NORMAL
112 #define SERIAL_TYPE_NORMAL 1
113 #define SERIAL_TYPE_CALLOUT 2
114 #endif
115
116 /* number of characters left in xmit buffer before we ask for more */
117 #define WAKEUP_CHARS 256
118
119 static struct async_struct *IRQ_ports;
120
121 static unsigned char current_ctl_bits;
122
123 static void change_speed(struct async_struct *info, struct termios *old);
124 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
125
126
127 static struct serial_state rs_table[1];
128
129 #define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
130
131
132 static struct tty_struct *serial_table[NR_PORTS];
133 static struct termios *serial_termios[NR_PORTS];
134 static struct termios *serial_termios_locked[NR_PORTS];
135
136 #ifndef MIN
137 #define MIN(a,b) ((a) < (b) ? (a) : (b))
138 #endif
139
140 /*
141 * tmp_buf is used as a temporary buffer by serial_write. We need to
142 * lock it in case the copy_from_user blocks while swapping in a page,
143 * and some other program tries to do a serial write at the same time.
144 * Since the lock will only come under contention when the system is
145 * swapping and available memory is low, it makes sense to share one
146 * buffer across all the serial ports, since it significantly saves
147 * memory if large numbers of serial ports are open.
148 */
149 static unsigned char *tmp_buf;
150 static DECLARE_MUTEX(tmp_buf_sem);
151
152 #include <asm/uaccess.h>
153
154 #define serial_isroot() (capable(CAP_SYS_ADMIN))
155
156
157 static inline int serial_paranoia_check(struct async_struct *info,
158 kdev_t device, const char *routine)
159 {
160 #ifdef SERIAL_PARANOIA_CHECK
161 static const char *badmagic =
162 "Warning: bad magic number for serial struct (%s) in %s\n";
163 static const char *badinfo =
164 "Warning: null async_struct for (%s) in %s\n";
165
166 if (!info) {
167 printk(badinfo, kdevname(device), routine);
168 return 1;
169 }
170 if (info->magic != SERIAL_MAGIC) {
171 printk(badmagic, kdevname(device), routine);
172 return 1;
173 }
174 #endif
175 return 0;
176 }
177
178 /* some serial hardware definitions */
179 #define SDR_OVRUN (1<<15)
180 #define SDR_RBF (1<<14)
181 #define SDR_TBE (1<<13)
182 #define SDR_TSRE (1<<12)
183
184 #define SERPER_PARENB (1<<15)
185
186 #define AC_SETCLR (1<<15)
187 #define AC_UARTBRK (1<<11)
188
189 #define SER_DTR (1<<7)
190 #define SER_RTS (1<<6)
191 #define SER_DCD (1<<5)
192 #define SER_CTS (1<<4)
193 #define SER_DSR (1<<3)
194
195 static __inline__ void rtsdtr_ctrl(int bits)
196 {
197 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
198 }
199
200 /*
201 * ------------------------------------------------------------
202 * rs_stop() and rs_start()
203 *
204 * This routines are called before setting or resetting tty->stopped.
205 * They enable or disable transmitter interrupts, as necessary.
206 * ------------------------------------------------------------
207 */
208 static void rs_stop(struct tty_struct *tty)
209 {
210 struct async_struct *info = (struct async_struct *)tty->driver_data;
211 unsigned long flags;
212
213 if (serial_paranoia_check(info, tty->device, "rs_stop"))
214 return;
215
216 save_flags(flags); cli();
217 if (info->IER & UART_IER_THRI) {
218 info->IER &= ~UART_IER_THRI;
219 /* disable Tx interrupt and remove any pending interrupts */
220 custom.intena = IF_TBE;
221 mb();
222 custom.intreq = IF_TBE;
223 mb();
224 }
225 restore_flags(flags);
226 }
227
228 static void rs_start(struct tty_struct *tty)
229 {
230 struct async_struct *info = (struct async_struct *)tty->driver_data;
231 unsigned long flags;
232
233 if (serial_paranoia_check(info, tty->device, "rs_start"))
234 return;
235
236 save_flags(flags); cli();
237 if (info->xmit.head != info->xmit.tail
238 && info->xmit.buf
239 && !(info->IER & UART_IER_THRI)) {
240 info->IER |= UART_IER_THRI;
241 custom.intena = IF_SETCLR | IF_TBE;
242 mb();
243 /* set a pending Tx Interrupt, transmitter should restart now */
244 custom.intreq = IF_SETCLR | IF_TBE;
245 mb();
246 }
247 restore_flags(flags);
248 }
249
250 /*
251 * ----------------------------------------------------------------------
252 *
253 * Here starts the interrupt handling routines. All of the following
254 * subroutines are declared as inline and are folded into
255 * rs_interrupt(). They were separated out for readability's sake.
256 *
257 * Note: rs_interrupt() is a "fast" interrupt, which means that it
258 * runs with interrupts turned off. People who may want to modify
259 * rs_interrupt() should try to keep the interrupt handler as fast as
260 * possible. After you are done making modifications, it is not a bad
261 * idea to do:
262 *
263 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
264 *
265 * and look at the resulting assemble code in serial.s.
266 *
267 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
268 * -----------------------------------------------------------------------
269 */
270
271 /*
272 * This routine is used by the interrupt handler to schedule
273 * processing in the software interrupt portion of the driver.
274 */
275 static _INLINE_ void rs_sched_event(struct async_struct *info,
276 int event)
277 {
278 info->event |= 1 << event;
279 queue_task(&info->tqueue, &tq_serial);
280 mark_bh(SERIAL_BH);
281 }
282
283 static _INLINE_ void receive_chars(struct async_struct *info)
284 {
285 int status;
286 int serdatr;
287 struct tty_struct *tty = info->tty;
288 unsigned char ch;
289 struct async_icount *icount;
290
291 icount = &info->state->icount;
292
293 status = UART_LSR_DR; /* We obviously have a character! */
294 serdatr = custom.serdatr;
295 mb();
296 custom.intreq = IF_RBF;
297 mb();
298
299 if((serdatr & 0x1ff) == 0)
300 status |= UART_LSR_BI;
301 if(serdatr & SDR_OVRUN)
302 status |= UART_LSR_OE;
303
304 ch = serdatr & 0xff;
305 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
306 goto ignore_char;
307 *tty->flip.char_buf_ptr = ch;
308 icount->rx++;
309
310 #ifdef SERIAL_DEBUG_INTR
311 printk("DR%02x:%02x...", ch, status);
312 #endif
313 *tty->flip.flag_buf_ptr = 0;
314
315 /*
316 * We don't handle parity or frame errors - but I have left
317 * the code in, since I'm not sure that the errors can't be
318 * detected.
319 */
320
321 if (status & (UART_LSR_BI | UART_LSR_PE |
322 UART_LSR_FE | UART_LSR_OE)) {
323 /*
324 * For statistics only
325 */
326 if (status & UART_LSR_BI) {
327 status &= ~(UART_LSR_FE | UART_LSR_PE);
328 icount->brk++;
329 } else if (status & UART_LSR_PE)
330 icount->parity++;
331 else if (status & UART_LSR_FE)
332 icount->frame++;
333 if (status & UART_LSR_OE)
334 icount->overrun++;
335
336 /*
337 * Now check to see if character should be
338 * ignored, and mask off conditions which
339 * should be ignored.
340 */
341 if (status & info->ignore_status_mask)
342 goto ignore_char;
343
344 status &= info->read_status_mask;
345
346 if (status & (UART_LSR_BI)) {
347 #ifdef SERIAL_DEBUG_INTR
348 printk("handling break....");
349 #endif
350 *tty->flip.flag_buf_ptr = TTY_BREAK;
351 if (info->flags & ASYNC_SAK)
352 do_SAK(tty);
353 } else if (status & UART_LSR_PE)
354 *tty->flip.flag_buf_ptr = TTY_PARITY;
355 else if (status & UART_LSR_FE)
356 *tty->flip.flag_buf_ptr = TTY_FRAME;
357 if (status & UART_LSR_OE) {
358 /*
359 * Overrun is special, since it's
360 * reported immediately, and doesn't
361 * affect the current character
362 */
363 if (tty->flip.count < TTY_FLIPBUF_SIZE) {
364 tty->flip.count++;
365 tty->flip.flag_buf_ptr++;
366 tty->flip.char_buf_ptr++;
367 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
368 }
369 }
370 }
371 tty->flip.flag_buf_ptr++;
372 tty->flip.char_buf_ptr++;
373 tty->flip.count++;
374 ignore_char:
375
376 tty_flip_buffer_push(tty);
377 }
378
379 static _INLINE_ void transmit_chars(struct async_struct *info)
380 {
381 custom.intreq = IF_TBE;
382 mb();
383 if (info->x_char) {
384 custom.serdat = info->x_char | 0x100;
385 mb();
386 info->state->icount.tx++;
387 info->x_char = 0;
388 return;
389 }
390 if (info->xmit.head == info->xmit.tail
391 || info->tty->stopped
392 || info->tty->hw_stopped) {
393 info->IER &= ~UART_IER_THRI;
394 custom.intena = IF_TBE;
395 mb();
396 return;
397 }
398
399 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
400 mb();
401 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
402 info->state->icount.tx++;
403
404 if (CIRC_CNT(info->xmit.head,
405 info->xmit.tail,
406 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
407 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
408
409 #ifdef SERIAL_DEBUG_INTR
410 printk("THRE...");
411 #endif
412 if (info->xmit.head == info->xmit.tail) {
413 custom.intena = IF_TBE;
414 mb();
415 info->IER &= ~UART_IER_THRI;
416 }
417 }
418
419 static _INLINE_ void check_modem_status(struct async_struct *info)
420 {
421 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
422 unsigned char dstatus;
423 struct async_icount *icount;
424
425 /* Determine bits that have changed */
426 dstatus = status ^ current_ctl_bits;
427 current_ctl_bits = status;
428
429 if (dstatus) {
430 icount = &info->state->icount;
431 /* update input line counters */
432 if (dstatus & SER_DSR)
433 icount->dsr++;
434 if (dstatus & SER_DCD) {
435 icount->dcd++;
436 #ifdef CONFIG_HARD_PPS
437 if ((info->flags & ASYNC_HARDPPS_CD) &&
438 !(status & SER_DCD))
439 hardpps();
440 #endif
441 }
442 if (dstatus & SER_CTS)
443 icount->cts++;
444 wake_up_interruptible(&info->delta_msr_wait);
445 }
446
447 if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
448 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
449 printk("ttyS%02d CD now %s...", info->line,
450 (!(status & SER_DCD)) ? "on" : "off");
451 #endif
452 if (!(status & SER_DCD))
453 wake_up_interruptible(&info->open_wait);
454 else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
455 (info->flags & ASYNC_CALLOUT_NOHUP))) {
456 #ifdef SERIAL_DEBUG_OPEN
457 printk("doing serial hangup...");
458 #endif
459 if (info->tty)
460 tty_hangup(info->tty);
461 }
462 }
463 if (info->flags & ASYNC_CTS_FLOW) {
464 if (info->tty->hw_stopped) {
465 if (!(status & SER_CTS)) {
466 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
467 printk("CTS tx start...");
468 #endif
469 info->tty->hw_stopped = 0;
470 info->IER |= UART_IER_THRI;
471 custom.intena = IF_SETCLR | IF_TBE;
472 mb();
473 /* set a pending Tx Interrupt, transmitter should restart now */
474 custom.intreq = IF_SETCLR | IF_TBE;
475 mb();
476 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
477 return;
478 }
479 } else {
480 if ((status & SER_CTS)) {
481 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
482 printk("CTS tx stop...");
483 #endif
484 info->tty->hw_stopped = 1;
485 info->IER &= ~UART_IER_THRI;
486 /* disable Tx interrupt and remove any pending interrupts */
487 custom.intena = IF_TBE;
488 mb();
489 custom.intreq = IF_TBE;
490 mb();
491 }
492 }
493 }
494 }
495
496 static void ser_vbl_int( int irq, void *data, struct pt_regs *regs)
497 {
498 /* vbl is just a periodic interrupt we tie into to update modem status */
499 struct async_struct * info = IRQ_ports;
500 /*
501 * TBD - is it better to unregister from this interrupt or to
502 * ignore it if MSI is clear ?
503 */
504 if(info->IER & UART_IER_MSI)
505 check_modem_status(info);
506 }
507
508 static void ser_rx_int(int irq, void *dev_id, struct pt_regs * regs)
509 {
510 struct async_struct * info;
511
512 #ifdef SERIAL_DEBUG_INTR
513 printk("ser_rx_int...");
514 #endif
515
516 info = IRQ_ports;
517 if (!info || !info->tty)
518 return;
519
520 receive_chars(info);
521 info->last_active = jiffies;
522 #ifdef SERIAL_DEBUG_INTR
523 printk("end.\n");
524 #endif
525 }
526
527 static void ser_tx_int(int irq, void *dev_id, struct pt_regs * regs)
528 {
529 struct async_struct * info;
530
531 if (custom.serdatr & SDR_TBE) {
532 #ifdef SERIAL_DEBUG_INTR
533 printk("ser_tx_int...");
534 #endif
535
536 info = IRQ_ports;
537 if (!info || !info->tty)
538 return;
539
540 transmit_chars(info);
541 info->last_active = jiffies;
542 #ifdef SERIAL_DEBUG_INTR
543 printk("end.\n");
544 #endif
545 }
546 }
547
548 /*
549 * -------------------------------------------------------------------
550 * Here ends the serial interrupt routines.
551 * -------------------------------------------------------------------
552 */
553
554 /*
555 * This routine is used to handle the "bottom half" processing for the
556 * serial driver, known also the "software interrupt" processing.
557 * This processing is done at the kernel interrupt level, after the
558 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
559 * is where time-consuming activities which can not be done in the
560 * interrupt driver proper are done; the interrupt driver schedules
561 * them using rs_sched_event(), and they get done here.
562 */
563 static void do_serial_bh(void)
564 {
565 run_task_queue(&tq_serial);
566 }
567
568 static void do_softint(void *private_)
569 {
570 struct async_struct *info = (struct async_struct *) private_;
571 struct tty_struct *tty;
572
573 tty = info->tty;
574 if (!tty)
575 return;
576
577 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
578 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
579 tty->ldisc.write_wakeup)
580 (tty->ldisc.write_wakeup)(tty);
581 wake_up_interruptible(&tty->write_wait);
582 }
583 }
584
585 /*
586 * ---------------------------------------------------------------
587 * Low level utility subroutines for the serial driver: routines to
588 * figure out the appropriate timeout for an interrupt chain, routines
589 * to initialize and startup a serial port, and routines to shutdown a
590 * serial port. Useful stuff like that.
591 * ---------------------------------------------------------------
592 */
593
594 static int startup(struct async_struct * info)
595 {
596 unsigned long flags;
597 int retval=0;
598 unsigned long page;
599
600 page = get_free_page(GFP_KERNEL);
601 if (!page)
602 return -ENOMEM;
603
604 save_flags(flags); cli();
605
606 if (info->flags & ASYNC_INITIALIZED) {
607 free_page(page);
608 goto errout;
609 }
610
611 if (info->xmit.buf)
612 free_page(page);
613 else
614 info->xmit.buf = (unsigned char *) page;
615
616 #ifdef SERIAL_DEBUG_OPEN
617 printk("starting up ttys%d ...", info->line);
618 #endif
619
620 /* Clear anything in the input buffer */
621
622 custom.intreq = IF_RBF;
623 mb();
624
625 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
626 if (retval) {
627 if (serial_isroot()) {
628 if (info->tty)
629 set_bit(TTY_IO_ERROR,
630 &info->tty->flags);
631 retval = 0;
632 }
633 goto errout;
634 }
635
636 /* enable both Rx and Tx interrupts */
637 custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
638 mb();
639 info->IER = UART_IER_MSI;
640
641 /* remember current state of the DCD and CTS bits */
642 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
643
644 IRQ_ports = info;
645
646 info->MCR = 0;
647 if (info->tty->termios->c_cflag & CBAUD)
648 info->MCR = SER_DTR | SER_RTS;
649 rtsdtr_ctrl(info->MCR);
650
651 if (info->tty)
652 clear_bit(TTY_IO_ERROR, &info->tty->flags);
653 info->xmit.head = info->xmit.tail = 0;
654
655 /*
656 * Set up the tty->alt_speed kludge
657 */
658 if (info->tty) {
659 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
660 info->tty->alt_speed = 57600;
661 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
662 info->tty->alt_speed = 115200;
663 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
664 info->tty->alt_speed = 230400;
665 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
666 info->tty->alt_speed = 460800;
667 }
668
669 /*
670 * and set the speed of the serial port
671 */
672 change_speed(info, 0);
673
674 info->flags |= ASYNC_INITIALIZED;
675 restore_flags(flags);
676 return 0;
677
678 errout:
679 restore_flags(flags);
680 return retval;
681 }
682
683 /*
684 * This routine will shutdown a serial port; interrupts are disabled, and
685 * DTR is dropped if the hangup on close termio flag is on.
686 */
687 static void shutdown(struct async_struct * info)
688 {
689 unsigned long flags;
690 struct serial_state *state;
691
692 if (!(info->flags & ASYNC_INITIALIZED))
693 return;
694
695 state = info->state;
696
697 #ifdef SERIAL_DEBUG_OPEN
698 printk("Shutting down serial port %d ....\n", info->line);
699 #endif
700
701 save_flags(flags); cli(); /* Disable interrupts */
702
703 /*
704 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
705 * here so the queue might never be waken up
706 */
707 wake_up_interruptible(&info->delta_msr_wait);
708
709 IRQ_ports = NULL;
710
711 /*
712 * Free the IRQ, if necessary
713 */
714 free_irq(IRQ_AMIGA_VERTB, info);
715
716 if (info->xmit.buf) {
717 free_page((unsigned long) info->xmit.buf);
718 info->xmit.buf = 0;
719 }
720
721 info->IER = 0;
722 custom.intena = IF_RBF | IF_TBE;
723 mb();
724
725 /* disable break condition */
726 custom.adkcon = AC_UARTBRK;
727 mb();
728
729 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
730 info->MCR &= ~(SER_DTR|SER_RTS);
731 rtsdtr_ctrl(info->MCR);
732
733 if (info->tty)
734 set_bit(TTY_IO_ERROR, &info->tty->flags);
735
736 info->flags &= ~ASYNC_INITIALIZED;
737 restore_flags(flags);
738 }
739
740
741 /*
742 * This routine is called to set the UART divisor registers to match
743 * the specified baud rate for a serial port.
744 */
745 static void change_speed(struct async_struct *info,
746 struct termios *old_termios)
747 {
748 int quot = 0, baud_base, baud;
749 unsigned cflag, cval = 0;
750 int bits;
751 unsigned long flags;
752
753 if (!info->tty || !info->tty->termios)
754 return;
755 cflag = info->tty->termios->c_cflag;
756
757 /* Byte size is always 8 bits plus parity bit if requested */
758
759 cval = 3; bits = 10;
760 if (cflag & CSTOPB) {
761 cval |= 0x04;
762 bits++;
763 }
764 if (cflag & PARENB) {
765 cval |= UART_LCR_PARITY;
766 bits++;
767 }
768 if (!(cflag & PARODD))
769 cval |= UART_LCR_EPAR;
770 #ifdef CMSPAR
771 if (cflag & CMSPAR)
772 cval |= UART_LCR_SPAR;
773 #endif
774
775 /* Determine divisor based on baud rate */
776 baud = tty_get_baud_rate(info->tty);
777 if (!baud)
778 baud = 9600; /* B0 transition handled in rs_set_termios */
779 baud_base = info->state->baud_base;
780 if (baud == 38400 &&
781 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
782 quot = info->state->custom_divisor;
783 else {
784 if (baud == 134)
785 /* Special case since 134 is really 134.5 */
786 quot = (2*baud_base / 269);
787 else if (baud)
788 quot = baud_base / baud;
789 }
790 /* If the quotient is zero refuse the change */
791 if (!quot && old_termios) {
792 info->tty->termios->c_cflag &= ~CBAUD;
793 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
794 baud = tty_get_baud_rate(info->tty);
795 if (!baud)
796 baud = 9600;
797 if (baud == 38400 &&
798 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
799 quot = info->state->custom_divisor;
800 else {
801 if (baud == 134)
802 /* Special case since 134 is really 134.5 */
803 quot = (2*baud_base / 269);
804 else if (baud)
805 quot = baud_base / baud;
806 }
807 }
808 /* As a last resort, if the quotient is zero, default to 9600 bps */
809 if (!quot)
810 quot = baud_base / 9600;
811 info->quot = quot;
812 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
813 info->timeout += HZ/50; /* Add .02 seconds of slop */
814
815 /* CTS flow control flag and modem status interrupts */
816 info->IER &= ~UART_IER_MSI;
817 if (info->flags & ASYNC_HARDPPS_CD)
818 info->IER |= UART_IER_MSI;
819 if (cflag & CRTSCTS) {
820 info->flags |= ASYNC_CTS_FLOW;
821 info->IER |= UART_IER_MSI;
822 } else
823 info->flags &= ~ASYNC_CTS_FLOW;
824 if (cflag & CLOCAL)
825 info->flags &= ~ASYNC_CHECK_CD;
826 else {
827 info->flags |= ASYNC_CHECK_CD;
828 info->IER |= UART_IER_MSI;
829 }
830 /* TBD:
831 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
832 */
833
834 /*
835 * Set up parity check flag
836 */
837 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
838
839 info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
840 if (I_INPCK(info->tty))
841 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
842 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
843 info->read_status_mask |= UART_LSR_BI;
844
845 /*
846 * Characters to ignore
847 */
848 info->ignore_status_mask = 0;
849 if (I_IGNPAR(info->tty))
850 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
851 if (I_IGNBRK(info->tty)) {
852 info->ignore_status_mask |= UART_LSR_BI;
853 /*
854 * If we're ignore parity and break indicators, ignore
855 * overruns too. (For real raw support).
856 */
857 if (I_IGNPAR(info->tty))
858 info->ignore_status_mask |= UART_LSR_OE;
859 }
860 /*
861 * !!! ignore all characters if CREAD is not set
862 */
863 if ((cflag & CREAD) == 0)
864 info->ignore_status_mask |= UART_LSR_DR;
865 save_flags(flags); cli();
866
867 {
868 short serper;
869
870 /* Set up the baud rate */
871 serper = quot - 1;
872
873 /* Enable or disable parity bit */
874
875 if(cval & UART_LCR_PARITY)
876 serper |= (SERPER_PARENB);
877
878 custom.serper = serper;
879 mb();
880 }
881
882 info->LCR = cval; /* Save LCR */
883 restore_flags(flags);
884 }
885
886 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
887 {
888 struct async_struct *info = (struct async_struct *)tty->driver_data;
889 unsigned long flags;
890
891 if (serial_paranoia_check(info, tty->device, "rs_put_char"))
892 return;
893
894 if (!tty || !info->xmit.buf)
895 return;
896
897 save_flags(flags); cli();
898 if (CIRC_SPACE(info->xmit.head,
899 info->xmit.tail,
900 SERIAL_XMIT_SIZE) == 0) {
901 restore_flags(flags);
902 return;
903 }
904
905 info->xmit.buf[info->xmit.head++] = ch;
906 info->xmit.head &= SERIAL_XMIT_SIZE-1;
907 restore_flags(flags);
908 }
909
910 static void rs_flush_chars(struct tty_struct *tty)
911 {
912 struct async_struct *info = (struct async_struct *)tty->driver_data;
913 unsigned long flags;
914
915 if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
916 return;
917
918 if (info->xmit.head == info->xmit.tail
919 || tty->stopped
920 || tty->hw_stopped
921 || !info->xmit.buf)
922 return;
923
924 save_flags(flags); cli();
925 info->IER |= UART_IER_THRI;
926 custom.intena = IF_SETCLR | IF_TBE;
927 mb();
928 /* set a pending Tx Interrupt, transmitter should restart now */
929 custom.intreq = IF_SETCLR | IF_TBE;
930 mb();
931 restore_flags(flags);
932 }
933
934 static int rs_write(struct tty_struct * tty, int from_user,
935 const unsigned char *buf, int count)
936 {
937 int c, ret = 0;
938 struct async_struct *info = (struct async_struct *)tty->driver_data;
939 unsigned long flags;
940
941 if (serial_paranoia_check(info, tty->device, "rs_write"))
942 return 0;
943
944 if (!tty || !info->xmit.buf || !tmp_buf)
945 return 0;
946
947 save_flags(flags);
948 if (from_user) {
949 down(&tmp_buf_sem);
950 while (1) {
951 int c1;
952 c = CIRC_SPACE_TO_END(info->xmit.head,
953 info->xmit.tail,
954 SERIAL_XMIT_SIZE);
955 if (count < c)
956 c = count;
957
958 c -= copy_from_user(tmp_buf, buf, c);
959 if (!c) {
960 if (!ret)
961 ret = -EFAULT;
962 break;
963 }
964 cli();
965 c1 = CIRC_SPACE_TO_END(info->xmit.head,
966 info->xmit.tail,
967 SERIAL_XMIT_SIZE);
968 if (c1 < c)
969 c = c1;
970 memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
971 info->xmit.head = ((info->xmit.head + c) &
972 (SERIAL_XMIT_SIZE-1));
973 restore_flags(flags);
974 buf += c;
975 count -= c;
976 ret += c;
977 }
978 up(&tmp_buf_sem);
979 } else {
980 cli();
981 while (1) {
982 c = CIRC_SPACE_TO_END(info->xmit.head,
983 info->xmit.tail,
984 SERIAL_XMIT_SIZE);
985 if (count < c)
986 c = count;
987 if (c <= 0) {
988 break;
989 }
990 memcpy(info->xmit.buf + info->xmit.head, buf, c);
991 info->xmit.head = ((info->xmit.head + c) &
992 (SERIAL_XMIT_SIZE-1));
993 buf += c;
994 count -= c;
995 ret += c;
996 }
997 restore_flags(flags);
998 }
999 if (info->xmit.head != info->xmit.tail
1000 && !tty->stopped
1001 && !tty->hw_stopped
1002 && !(info->IER & UART_IER_THRI)) {
1003 info->IER |= UART_IER_THRI;
1004 cli();
1005 custom.intena = IF_SETCLR | IF_TBE;
1006 mb();
1007 /* set a pending Tx Interrupt, transmitter should restart now */
1008 custom.intreq = IF_SETCLR | IF_TBE;
1009 mb();
1010 restore_flags(flags);
1011 }
1012 return ret;
1013 }
1014
1015 static int rs_write_room(struct tty_struct *tty)
1016 {
1017 struct async_struct *info = (struct async_struct *)tty->driver_data;
1018
1019 if (serial_paranoia_check(info, tty->device, "rs_write_room"))
1020 return 0;
1021 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
1022 }
1023
1024 static int rs_chars_in_buffer(struct tty_struct *tty)
1025 {
1026 struct async_struct *info = (struct async_struct *)tty->driver_data;
1027
1028 if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
1029 return 0;
1030 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
1031 }
1032
1033 static void rs_flush_buffer(struct tty_struct *tty)
1034 {
1035 struct async_struct *info = (struct async_struct *)tty->driver_data;
1036 unsigned long flags;
1037
1038 if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
1039 return;
1040 save_flags(flags); cli();
1041 info->xmit.head = info->xmit.tail = 0;
1042 restore_flags(flags);
1043 wake_up_interruptible(&tty->write_wait);
1044 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
1045 tty->ldisc.write_wakeup)
1046 (tty->ldisc.write_wakeup)(tty);
1047 }
1048
1049 /*
1050 * This function is used to send a high-priority XON/XOFF character to
1051 * the device
1052 */
1053 static void rs_send_xchar(struct tty_struct *tty, char ch)
1054 {
1055 struct async_struct *info = (struct async_struct *)tty->driver_data;
1056 unsigned long flags;
1057
1058 if (serial_paranoia_check(info, tty->device, "rs_send_char"))
1059 return;
1060
1061 info->x_char = ch;
1062 if (ch) {
1063 /* Make sure transmit interrupts are on */
1064
1065 /* Check this ! */
1066 save_flags(flags);
1067 cli();
1068 if(!(custom.intenar & IF_TBE)) {
1069 custom.intena = IF_SETCLR | IF_TBE;
1070 mb();
1071 /* set a pending Tx Interrupt, transmitter should restart now */
1072 custom.intreq = IF_SETCLR | IF_TBE;
1073 mb();
1074 }
1075 restore_flags(flags);
1076
1077 info->IER |= UART_IER_THRI;
1078 }
1079 }
1080
1081 /*
1082 * ------------------------------------------------------------
1083 * rs_throttle()
1084 *
1085 * This routine is called by the upper-layer tty layer to signal that
1086 * incoming characters should be throttled.
1087 * ------------------------------------------------------------
1088 */
1089 static void rs_throttle(struct tty_struct * tty)
1090 {
1091 struct async_struct *info = (struct async_struct *)tty->driver_data;
1092 unsigned long flags;
1093 #ifdef SERIAL_DEBUG_THROTTLE
1094 char buf[64];
1095
1096 printk("throttle %s: %d....\n", tty_name(tty, buf),
1097 tty->ldisc.chars_in_buffer(tty));
1098 #endif
1099
1100 if (serial_paranoia_check(info, tty->device, "rs_throttle"))
1101 return;
1102
1103 if (I_IXOFF(tty))
1104 rs_send_xchar(tty, STOP_CHAR(tty));
1105
1106 if (tty->termios->c_cflag & CRTSCTS)
1107 info->MCR &= ~SER_RTS;
1108
1109 save_flags(flags); cli();
1110 rtsdtr_ctrl(info->MCR);
1111 restore_flags(flags);
1112 }
1113
1114 static void rs_unthrottle(struct tty_struct * tty)
1115 {
1116 struct async_struct *info = (struct async_struct *)tty->driver_data;
1117 unsigned long flags;
1118 #ifdef SERIAL_DEBUG_THROTTLE
1119 char buf[64];
1120
1121 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1122 tty->ldisc.chars_in_buffer(tty));
1123 #endif
1124
1125 if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
1126 return;
1127
1128 if (I_IXOFF(tty)) {
1129 if (info->x_char)
1130 info->x_char = 0;
1131 else
1132 rs_send_xchar(tty, START_CHAR(tty));
1133 }
1134 if (tty->termios->c_cflag & CRTSCTS)
1135 info->MCR |= SER_RTS;
1136 save_flags(flags); cli();
1137 rtsdtr_ctrl(info->MCR);
1138 restore_flags(flags);
1139 }
1140
1141 /*
1142 * ------------------------------------------------------------
1143 * rs_ioctl() and friends
1144 * ------------------------------------------------------------
1145 */
1146
1147 static int get_serial_info(struct async_struct * info,
1148 struct serial_struct * retinfo)
1149 {
1150 struct serial_struct tmp;
1151 struct serial_state *state = info->state;
1152
1153 if (!retinfo)
1154 return -EFAULT;
1155 memset(&tmp, 0, sizeof(tmp));
1156 tmp.type = state->type;
1157 tmp.line = state->line;
1158 tmp.port = state->port;
1159 tmp.irq = state->irq;
1160 tmp.flags = state->flags;
1161 tmp.xmit_fifo_size = state->xmit_fifo_size;
1162 tmp.baud_base = state->baud_base;
1163 tmp.close_delay = state->close_delay;
1164 tmp.closing_wait = state->closing_wait;
1165 tmp.custom_divisor = state->custom_divisor;
1166 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1167 return -EFAULT;
1168 return 0;
1169 }
1170
1171 static int set_serial_info(struct async_struct * info,
1172 struct serial_struct * new_info)
1173 {
1174 struct serial_struct new_serial;
1175 struct serial_state old_state, *state;
1176 unsigned int change_irq,change_port;
1177 int retval = 0;
1178
1179 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1180 return -EFAULT;
1181 state = info->state;
1182 old_state = *state;
1183
1184 change_irq = new_serial.irq != state->irq;
1185 change_port = (new_serial.port != state->port);
1186 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1187 return -EINVAL;
1188
1189 if (!serial_isroot()) {
1190 if ((new_serial.baud_base != state->baud_base) ||
1191 (new_serial.close_delay != state->close_delay) ||
1192 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1193 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1194 (state->flags & ~ASYNC_USR_MASK)))
1195 return -EPERM;
1196 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1197 (new_serial.flags & ASYNC_USR_MASK));
1198 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1199 (new_serial.flags & ASYNC_USR_MASK));
1200 state->custom_divisor = new_serial.custom_divisor;
1201 goto check_and_exit;
1202 }
1203
1204 if (new_serial.baud_base < 9600)
1205 return -EINVAL;
1206
1207 /*
1208 * OK, past this point, all the error checking has been done.
1209 * At this point, we start making changes.....
1210 */
1211
1212 state->baud_base = new_serial.baud_base;
1213 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1214 (new_serial.flags & ASYNC_FLAGS));
1215 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1216 (info->flags & ASYNC_INTERNAL_FLAGS));
1217 state->custom_divisor = new_serial.custom_divisor;
1218 state->close_delay = new_serial.close_delay * HZ/100;
1219 state->closing_wait = new_serial.closing_wait * HZ/100;
1220 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1221
1222 check_and_exit:
1223 if (info->flags & ASYNC_INITIALIZED) {
1224 if (((old_state.flags & ASYNC_SPD_MASK) !=
1225 (state->flags & ASYNC_SPD_MASK)) ||
1226 (old_state.custom_divisor != state->custom_divisor)) {
1227 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1228 info->tty->alt_speed = 57600;
1229 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1230 info->tty->alt_speed = 115200;
1231 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1232 info->tty->alt_speed = 230400;
1233 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1234 info->tty->alt_speed = 460800;
1235 change_speed(info, 0);
1236 }
1237 } else
1238 retval = startup(info);
1239 return retval;
1240 }
1241
1242
1243 /*
1244 * get_lsr_info - get line status register info
1245 *
1246 * Purpose: Let user call ioctl() to get info when the UART physically
1247 * is emptied. On bus types like RS485, the transmitter must
1248 * release the bus after transmitting. This must be done when
1249 * the transmit shift register is empty, not be done when the
1250 * transmit holding register is empty. This functionality
1251 * allows an RS485 driver to be written in user space.
1252 */
1253 static int get_lsr_info(struct async_struct * info, unsigned int *value)
1254 {
1255 unsigned char status;
1256 unsigned int result;
1257 unsigned long flags;
1258
1259 save_flags(flags); cli();
1260 status = custom.serdatr;
1261 mb();
1262 restore_flags(flags);
1263 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1264 if (copy_to_user(value, &result, sizeof(int)))
1265 return -EFAULT;
1266 return 0;
1267 }
1268
1269
1270 static int get_modem_info(struct async_struct * info, unsigned int *value)
1271 {
1272 unsigned char control, status;
1273 unsigned int result;
1274 unsigned long flags;
1275
1276 control = info->MCR;
1277 save_flags(flags); cli();
1278 status = ciab.pra;
1279 restore_flags(flags);
1280 result = ((control & SER_RTS) ? TIOCM_RTS : 0)
1281 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1282 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1283 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1284 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1285 if (copy_to_user(value, &result, sizeof(int)))
1286 return -EFAULT;
1287 return 0;
1288 }
1289
1290 static int set_modem_info(struct async_struct * info, unsigned int cmd,
1291 unsigned int *value)
1292 {
1293 unsigned int arg;
1294 unsigned long flags;
1295
1296 if (copy_from_user(&arg, value, sizeof(int)))
1297 return -EFAULT;
1298
1299 switch (cmd) {
1300 case TIOCMBIS:
1301 if (arg & TIOCM_RTS)
1302 info->MCR |= SER_RTS;
1303 if (arg & TIOCM_DTR)
1304 info->MCR |= SER_DTR;
1305 break;
1306 case TIOCMBIC:
1307 if (arg & TIOCM_RTS)
1308 info->MCR &= ~SER_RTS;
1309 if (arg & TIOCM_DTR)
1310 info->MCR &= ~SER_DTR;
1311 break;
1312 case TIOCMSET:
1313 info->MCR = ((info->MCR & ~(SER_RTS | SER_DTR))
1314 | ((arg & TIOCM_RTS) ? SER_RTS : 0)
1315 | ((arg & TIOCM_DTR) ? SER_DTR : 0));
1316 break;
1317 default:
1318 return -EINVAL;
1319 }
1320 save_flags(flags); cli();
1321 rtsdtr_ctrl(info->MCR);
1322 restore_flags(flags);
1323 return 0;
1324 }
1325
1326 /*
1327 * rs_break() --- routine which turns the break handling on or off
1328 */
1329 static void rs_break(struct tty_struct *tty, int break_state)
1330 {
1331 struct async_struct * info = (struct async_struct *)tty->driver_data;
1332 unsigned long flags;
1333
1334 if (serial_paranoia_check(info, tty->device, "rs_break"))
1335 return;
1336
1337 save_flags(flags); cli();
1338 if (break_state == -1)
1339 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1340 else
1341 custom.adkcon = AC_UARTBRK;
1342 mb();
1343 restore_flags(flags);
1344 }
1345
1346
1347 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1348 unsigned int cmd, unsigned long arg)
1349 {
1350 struct async_struct * info = (struct async_struct *)tty->driver_data;
1351 struct async_icount cprev, cnow; /* kernel counter temps */
1352 struct serial_icounter_struct icount;
1353 unsigned long flags;
1354
1355 if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
1356 return -ENODEV;
1357
1358 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1359 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1360 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1361 if (tty->flags & (1 << TTY_IO_ERROR))
1362 return -EIO;
1363 }
1364
1365 switch (cmd) {
1366 case TIOCMGET:
1367 return get_modem_info(info, (unsigned int *) arg);
1368 case TIOCMBIS:
1369 case TIOCMBIC:
1370 case TIOCMSET:
1371 return set_modem_info(info, cmd, (unsigned int *) arg);
1372 case TIOCGSERIAL:
1373 return get_serial_info(info,
1374 (struct serial_struct *) arg);
1375 case TIOCSSERIAL:
1376 return set_serial_info(info,
1377 (struct serial_struct *) arg);
1378 case TIOCSERCONFIG:
1379 return 0;
1380
1381 case TIOCSERGETLSR: /* Get line status register */
1382 return get_lsr_info(info, (unsigned int *) arg);
1383
1384 case TIOCSERGSTRUCT:
1385 if (copy_to_user((struct async_struct *) arg,
1386 info, sizeof(struct async_struct)))
1387 return -EFAULT;
1388 return 0;
1389
1390 /*
1391 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1392 * - mask passed in arg for lines of interest
1393 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1394 * Caller should use TIOCGICOUNT to see which one it was
1395 */
1396 case TIOCMIWAIT:
1397 save_flags(flags); cli();
1398 /* note the counters on entry */
1399 cprev = info->state->icount;
1400 restore_flags(flags);
1401 while (1) {
1402 interruptible_sleep_on(&info->delta_msr_wait);
1403 /* see if a signal did it */
1404 if (signal_pending(current))
1405 return -ERESTARTSYS;
1406 save_flags(flags); cli();
1407 cnow = info->state->icount; /* atomic copy */
1408 restore_flags(flags);
1409 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1410 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1411 return -EIO; /* no change => error */
1412 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1413 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1414 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1415 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1416 return 0;
1417 }
1418 cprev = cnow;
1419 }
1420 /* NOTREACHED */
1421
1422 /*
1423 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1424 * Return: write counters to the user passed counter struct
1425 * NB: both 1->0 and 0->1 transitions are counted except for
1426 * RI where only 0->1 is counted.
1427 */
1428 case TIOCGICOUNT:
1429 save_flags(flags); cli();
1430 cnow = info->state->icount;
1431 restore_flags(flags);
1432 icount.cts = cnow.cts;
1433 icount.dsr = cnow.dsr;
1434 icount.rng = cnow.rng;
1435 icount.dcd = cnow.dcd;
1436 icount.rx = cnow.rx;
1437 icount.tx = cnow.tx;
1438 icount.frame = cnow.frame;
1439 icount.overrun = cnow.overrun;
1440 icount.parity = cnow.parity;
1441 icount.brk = cnow.brk;
1442 icount.buf_overrun = cnow.buf_overrun;
1443
1444 if (copy_to_user((void *)arg, &icount, sizeof(icount)))
1445 return -EFAULT;
1446 return 0;
1447 case TIOCSERGWILD:
1448 case TIOCSERSWILD:
1449 /* "setserial -W" is called in Debian boot */
1450 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1451 return 0;
1452
1453 default:
1454 return -ENOIOCTLCMD;
1455 }
1456 return 0;
1457 }
1458
1459 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1460 {
1461 struct async_struct *info = (struct async_struct *)tty->driver_data;
1462 unsigned long flags;
1463 unsigned int cflag = tty->termios->c_cflag;
1464
1465 if ( (cflag == old_termios->c_cflag)
1466 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
1467 == RELEVANT_IFLAG(old_termios->c_iflag)))
1468 return;
1469
1470 change_speed(info, old_termios);
1471
1472 /* Handle transition to B0 status */
1473 if ((old_termios->c_cflag & CBAUD) &&
1474 !(cflag & CBAUD)) {
1475 info->MCR &= ~(SER_DTR|SER_RTS);
1476 save_flags(flags); cli();
1477 rtsdtr_ctrl(info->MCR);
1478 restore_flags(flags);
1479 }
1480
1481 /* Handle transition away from B0 status */
1482 if (!(old_termios->c_cflag & CBAUD) &&
1483 (cflag & CBAUD)) {
1484 info->MCR |= SER_DTR;
1485 if (!(tty->termios->c_cflag & CRTSCTS) ||
1486 !test_bit(TTY_THROTTLED, &tty->flags)) {
1487 info->MCR |= SER_RTS;
1488 }
1489 save_flags(flags); cli();
1490 rtsdtr_ctrl(info->MCR);
1491 restore_flags(flags);
1492 }
1493
1494 /* Handle turning off CRTSCTS */
1495 if ((old_termios->c_cflag & CRTSCTS) &&
1496 !(tty->termios->c_cflag & CRTSCTS)) {
1497 tty->hw_stopped = 0;
1498 rs_start(tty);
1499 }
1500
1501 #if 0
1502 /*
1503 * No need to wake up processes in open wait, since they
1504 * sample the CLOCAL flag once, and don't recheck it.
1505 * XXX It's not clear whether the current behavior is correct
1506 * or not. Hence, this may change.....
1507 */
1508 if (!(old_termios->c_cflag & CLOCAL) &&
1509 (tty->termios->c_cflag & CLOCAL))
1510 wake_up_interruptible(&info->open_wait);
1511 #endif
1512 }
1513
1514 /*
1515 * ------------------------------------------------------------
1516 * rs_close()
1517 *
1518 * This routine is called when the serial port gets closed. First, we
1519 * wait for the last remaining data to be sent. Then, we unlink its
1520 * async structure from the interrupt chain if necessary, and we free
1521 * that IRQ if nothing is left in the chain.
1522 * ------------------------------------------------------------
1523 */
1524 static void rs_close(struct tty_struct *tty, struct file * filp)
1525 {
1526 struct async_struct * info = (struct async_struct *)tty->driver_data;
1527 struct serial_state *state;
1528 unsigned long flags;
1529
1530 if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
1531 return;
1532
1533 state = info->state;
1534
1535 save_flags(flags); cli();
1536
1537 if (tty_hung_up_p(filp)) {
1538 DBG_CNT("before DEC-hung");
1539 MOD_DEC_USE_COUNT;
1540 restore_flags(flags);
1541 return;
1542 }
1543
1544 #ifdef SERIAL_DEBUG_OPEN
1545 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1546 #endif
1547 if ((tty->count == 1) && (state->count != 1)) {
1548 /*
1549 * Uh, oh. tty->count is 1, which means that the tty
1550 * structure will be freed. state->count should always
1551 * be one in these conditions. If it's greater than
1552 * one, we've got real problems, since it means the
1553 * serial port won't be shutdown.
1554 */
1555 printk("rs_close: bad serial port count; tty->count is 1, "
1556 "state->count is %d\n", state->count);
1557 state->count = 1;
1558 }
1559 if (--state->count < 0) {
1560 printk("rs_close: bad serial port count for ttys%d: %d\n",
1561 info->line, state->count);
1562 state->count = 0;
1563 }
1564 if (state->count) {
1565 DBG_CNT("before DEC-2");
1566 MOD_DEC_USE_COUNT;
1567 restore_flags(flags);
1568 return;
1569 }
1570 info->flags |= ASYNC_CLOSING;
1571 /*
1572 * Save the termios structure, since this port may have
1573 * separate termios for callout and dialin.
1574 */
1575 if (info->flags & ASYNC_NORMAL_ACTIVE)
1576 info->state->normal_termios = *tty->termios;
1577 if (info->flags & ASYNC_CALLOUT_ACTIVE)
1578 info->state->callout_termios = *tty->termios;
1579 /*
1580 * Now we wait for the transmit buffer to clear; and we notify
1581 * the line discipline to only process XON/XOFF characters.
1582 */
1583 tty->closing = 1;
1584 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1585 tty_wait_until_sent(tty, info->closing_wait);
1586 /*
1587 * At this point we stop accepting input. To do this, we
1588 * disable the receive line status interrupts, and tell the
1589 * interrupt driver to stop checking the data ready bit in the
1590 * line status register.
1591 */
1592 info->read_status_mask &= ~UART_LSR_DR;
1593 if (info->flags & ASYNC_INITIALIZED) {
1594 /* disable receive interrupts */
1595 custom.intena = IF_RBF;
1596 mb();
1597 /* clear any pending receive interrupt */
1598 custom.intreq = IF_RBF;
1599 mb();
1600
1601 /*
1602 * Before we drop DTR, make sure the UART transmitter
1603 * has completely drained; this is especially
1604 * important if there is a transmit FIFO!
1605 */
1606 rs_wait_until_sent(tty, info->timeout);
1607 }
1608 shutdown(info);
1609 if (tty->driver.flush_buffer)
1610 tty->driver.flush_buffer(tty);
1611 if (tty->ldisc.flush_buffer)
1612 tty->ldisc.flush_buffer(tty);
1613 tty->closing = 0;
1614 info->event = 0;
1615 info->tty = 0;
1616 if (info->blocked_open) {
1617 if (info->close_delay) {
1618 current->state = TASK_INTERRUPTIBLE;
1619 schedule_timeout(info->close_delay);
1620 }
1621 wake_up_interruptible(&info->open_wait);
1622 }
1623 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
1624 ASYNC_CLOSING);
1625 wake_up_interruptible(&info->close_wait);
1626 MOD_DEC_USE_COUNT;
1627 restore_flags(flags);
1628 }
1629
1630 /*
1631 * rs_wait_until_sent() --- wait until the transmitter is empty
1632 */
1633 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1634 {
1635 struct async_struct * info = (struct async_struct *)tty->driver_data;
1636 unsigned long orig_jiffies, char_time;
1637 int lsr;
1638
1639 if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
1640 return;
1641
1642 if (info->xmit_fifo_size == 0)
1643 return; /* Just in case.... */
1644
1645 orig_jiffies = jiffies;
1646 /*
1647 * Set the check interval to be 1/5 of the estimated time to
1648 * send a single character, and make it at least 1. The check
1649 * interval should also be less than the timeout.
1650 *
1651 * Note: we have to use pretty tight timings here to satisfy
1652 * the NIST-PCTS.
1653 */
1654 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1655 char_time = char_time / 5;
1656 if (char_time == 0)
1657 char_time = 1;
1658 if (timeout)
1659 char_time = MIN(char_time, timeout);
1660 /*
1661 * If the transmitter hasn't cleared in twice the approximate
1662 * amount of time to send the entire FIFO, it probably won't
1663 * ever clear. This assumes the UART isn't doing flow
1664 * control, which is currently the case. Hence, if it ever
1665 * takes longer than info->timeout, this is probably due to a
1666 * UART bug of some kind. So, we clamp the timeout parameter at
1667 * 2*info->timeout.
1668 */
1669 if (!timeout || timeout > 2*info->timeout)
1670 timeout = 2*info->timeout;
1671 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1672 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1673 printk("jiff=%lu...", jiffies);
1674 #endif
1675 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1676 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1677 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1678 #endif
1679 current->state = TASK_INTERRUPTIBLE;
1680 schedule_timeout(char_time);
1681 if (signal_pending(current))
1682 break;
1683 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1684 break;
1685 }
1686 current->state = TASK_RUNNING;
1687 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1688 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1689 #endif
1690 }
1691
1692 /*
1693 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1694 */
1695 static void rs_hangup(struct tty_struct *tty)
1696 {
1697 struct async_struct * info = (struct async_struct *)tty->driver_data;
1698 struct serial_state *state = info->state;
1699
1700 if (serial_paranoia_check(info, tty->device, "rs_hangup"))
1701 return;
1702
1703 state = info->state;
1704
1705 rs_flush_buffer(tty);
1706 shutdown(info);
1707 info->event = 0;
1708 state->count = 0;
1709 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
1710 info->tty = 0;
1711 wake_up_interruptible(&info->open_wait);
1712 }
1713
1714 /*
1715 * ------------------------------------------------------------
1716 * rs_open() and friends
1717 * ------------------------------------------------------------
1718 */
1719 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1720 struct async_struct *info)
1721 {
1722 #ifdef DECLARE_WAITQUEUE
1723 DECLARE_WAITQUEUE(wait, current);
1724 #else
1725 struct wait_queue wait = { current, NULL };
1726 #endif
1727 struct serial_state *state = info->state;
1728 int retval;
1729 int do_clocal = 0, extra_count = 0;
1730 unsigned long flags;
1731
1732 /*
1733 * If the device is in the middle of being closed, then block
1734 * until it's done, and then try again.
1735 */
1736 if (tty_hung_up_p(filp) ||
1737 (info->flags & ASYNC_CLOSING)) {
1738 if (info->flags & ASYNC_CLOSING)
1739 interruptible_sleep_on(&info->close_wait);
1740 #ifdef SERIAL_DO_RESTART
1741 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1742 -EAGAIN : -ERESTARTSYS);
1743 #else
1744 return -EAGAIN;
1745 #endif
1746 }
1747
1748 /*
1749 * If this is a callout device, then just make sure the normal
1750 * device isn't being used.
1751 */
1752 if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
1753 if (info->flags & ASYNC_NORMAL_ACTIVE)
1754 return -EBUSY;
1755 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1756 (info->flags & ASYNC_SESSION_LOCKOUT) &&
1757 (info->session != current->session))
1758 return -EBUSY;
1759 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1760 (info->flags & ASYNC_PGRP_LOCKOUT) &&
1761 (info->pgrp != current->pgrp))
1762 return -EBUSY;
1763 info->flags |= ASYNC_CALLOUT_ACTIVE;
1764 return 0;
1765 }
1766
1767 /*
1768 * If non-blocking mode is set, or the port is not enabled,
1769 * then make the check up front and then exit.
1770 */
1771 if ((filp->f_flags & O_NONBLOCK) ||
1772 (tty->flags & (1 << TTY_IO_ERROR))) {
1773 if (info->flags & ASYNC_CALLOUT_ACTIVE)
1774 return -EBUSY;
1775 info->flags |= ASYNC_NORMAL_ACTIVE;
1776 return 0;
1777 }
1778
1779 if (info->flags & ASYNC_CALLOUT_ACTIVE) {
1780 if (state->normal_termios.c_cflag & CLOCAL)
1781 do_clocal = 1;
1782 } else {
1783 if (tty->termios->c_cflag & CLOCAL)
1784 do_clocal = 1;
1785 }
1786
1787 /*
1788 * Block waiting for the carrier detect and the line to become
1789 * free (i.e., not in use by the callout). While we are in
1790 * this loop, state->count is dropped by one, so that
1791 * rs_close() knows when to free things. We restore it upon
1792 * exit, either normal or abnormal.
1793 */
1794 retval = 0;
1795 add_wait_queue(&info->open_wait, &wait);
1796 #ifdef SERIAL_DEBUG_OPEN
1797 printk("block_til_ready before block: ttys%d, count = %d\n",
1798 state->line, state->count);
1799 #endif
1800 save_flags(flags); cli();
1801 if (!tty_hung_up_p(filp)) {
1802 extra_count = 1;
1803 state->count--;
1804 }
1805 restore_flags(flags);
1806 info->blocked_open++;
1807 while (1) {
1808 save_flags(flags); cli();
1809 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
1810 (tty->termios->c_cflag & CBAUD))
1811 rtsdtr_ctrl(SER_DTR|SER_RTS);
1812 restore_flags(flags);
1813 set_current_state(TASK_INTERRUPTIBLE);
1814 if (tty_hung_up_p(filp) ||
1815 !(info->flags & ASYNC_INITIALIZED)) {
1816 #ifdef SERIAL_DO_RESTART
1817 if (info->flags & ASYNC_HUP_NOTIFY)
1818 retval = -EAGAIN;
1819 else
1820 retval = -ERESTARTSYS;
1821 #else
1822 retval = -EAGAIN;
1823 #endif
1824 break;
1825 }
1826 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
1827 !(info->flags & ASYNC_CLOSING) &&
1828 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1829 break;
1830 if (signal_pending(current)) {
1831 retval = -ERESTARTSYS;
1832 break;
1833 }
1834 #ifdef SERIAL_DEBUG_OPEN
1835 printk("block_til_ready blocking: ttys%d, count = %d\n",
1836 info->line, state->count);
1837 #endif
1838 schedule();
1839 }
1840 current->state = TASK_RUNNING;
1841 remove_wait_queue(&info->open_wait, &wait);
1842 if (extra_count)
1843 state->count++;
1844 info->blocked_open--;
1845 #ifdef SERIAL_DEBUG_OPEN
1846 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1847 info->line, state->count);
1848 #endif
1849 if (retval)
1850 return retval;
1851 info->flags |= ASYNC_NORMAL_ACTIVE;
1852 return 0;
1853 }
1854
1855 static int get_async_struct(int line, struct async_struct **ret_info)
1856 {
1857 struct async_struct *info;
1858 struct serial_state *sstate;
1859
1860 sstate = rs_table + line;
1861 sstate->count++;
1862 if (sstate->info) {
1863 *ret_info = sstate->info;
1864 return 0;
1865 }
1866 info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1867 if (!info) {
1868 sstate->count--;
1869 return -ENOMEM;
1870 }
1871 memset(info, 0, sizeof(struct async_struct));
1872 #ifdef DECLARE_WAITQUEUE
1873 init_waitqueue_head(&info->open_wait);
1874 init_waitqueue_head(&info->close_wait);
1875 init_waitqueue_head(&info->delta_msr_wait);
1876 #endif
1877 info->magic = SERIAL_MAGIC;
1878 info->port = sstate->port;
1879 info->flags = sstate->flags;
1880 info->xmit_fifo_size = sstate->xmit_fifo_size;
1881 info->line = line;
1882 info->tqueue.routine = do_softint;
1883 info->tqueue.data = info;
1884 info->state = sstate;
1885 if (sstate->info) {
1886 kfree(info);
1887 *ret_info = sstate->info;
1888 return 0;
1889 }
1890 *ret_info = sstate->info = info;
1891 return 0;
1892 }
1893
1894 /*
1895 * This routine is called whenever a serial port is opened. It
1896 * enables interrupts for a serial port, linking in its async structure into
1897 * the IRQ chain. It also performs the serial-specific
1898 * initialization for the tty structure.
1899 */
1900 static int rs_open(struct tty_struct *tty, struct file * filp)
1901 {
1902 struct async_struct *info;
1903 int retval, line;
1904 unsigned long page;
1905
1906 MOD_INC_USE_COUNT;
1907 line = MINOR(tty->device) - tty->driver.minor_start;
1908 if ((line < 0) || (line >= NR_PORTS)) {
1909 MOD_DEC_USE_COUNT;
1910 return -ENODEV;
1911 }
1912 retval = get_async_struct(line, &info);
1913 if (retval) {
1914 MOD_DEC_USE_COUNT;
1915 return retval;
1916 }
1917 tty->driver_data = info;
1918 info->tty = tty;
1919 if (serial_paranoia_check(info, tty->device, "rs_open"))
1920 return -ENODEV;
1921
1922 #ifdef SERIAL_DEBUG_OPEN
1923 printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
1924 info->state->count);
1925 #endif
1926 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1927
1928 if (!tmp_buf) {
1929 page = get_free_page(GFP_KERNEL);
1930 if (!page) {
1931 return -ENOMEM;
1932 }
1933 if (tmp_buf)
1934 free_page(page);
1935 else
1936 tmp_buf = (unsigned char *) page;
1937 }
1938
1939 /*
1940 * If the port is the middle of closing, bail out now
1941 */
1942 if (tty_hung_up_p(filp) ||
1943 (info->flags & ASYNC_CLOSING)) {
1944 if (info->flags & ASYNC_CLOSING)
1945 interruptible_sleep_on(&info->close_wait);
1946 #ifdef SERIAL_DO_RESTART
1947 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1948 -EAGAIN : -ERESTARTSYS);
1949 #else
1950 return -EAGAIN;
1951 #endif
1952 }
1953
1954 /*
1955 * Start up serial port
1956 */
1957 retval = startup(info);
1958 if (retval) {
1959 return retval;
1960 }
1961
1962 retval = block_til_ready(tty, filp, info);
1963 if (retval) {
1964 #ifdef SERIAL_DEBUG_OPEN
1965 printk("rs_open returning after block_til_ready with %d\n",
1966 retval);
1967 #endif
1968 return retval;
1969 }
1970
1971 if ((info->state->count == 1) &&
1972 (info->flags & ASYNC_SPLIT_TERMIOS)) {
1973 if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
1974 *tty->termios = info->state->normal_termios;
1975 else
1976 *tty->termios = info->state->callout_termios;
1977 change_speed(info, 0);
1978 }
1979 info->session = current->session;
1980 info->pgrp = current->pgrp;
1981
1982 #ifdef SERIAL_DEBUG_OPEN
1983 printk("rs_open ttys%d successful...", info->line);
1984 #endif
1985 return 0;
1986 }
1987
1988 /*
1989 * /proc fs routines....
1990 */
1991
1992 static inline int line_info(char *buf, struct serial_state *state)
1993 {
1994 struct async_struct *info = state->info, scr_info;
1995 char stat_buf[30], control, status;
1996 int ret;
1997 unsigned long flags;
1998
1999 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
2000
2001 /*
2002 * Figure out the current RS-232 lines
2003 */
2004 if (!info) {
2005 info = &scr_info; /* This is just for serial_{in,out} */
2006
2007 info->magic = SERIAL_MAGIC;
2008 info->flags = state->flags;
2009 info->quot = 0;
2010 info->tty = 0;
2011 }
2012 save_flags(flags); cli();
2013 status = ciab.pra;
2014 control = info ? info->MCR : status;
2015 restore_flags(flags);
2016
2017 stat_buf[0] = 0;
2018 stat_buf[1] = 0;
2019 if(!(control & SER_RTS))
2020 strcat(stat_buf, "|RTS");
2021 if(!(status & SER_CTS))
2022 strcat(stat_buf, "|CTS");
2023 if(!(control & SER_DTR))
2024 strcat(stat_buf, "|DTR");
2025 if(!(status & SER_DSR))
2026 strcat(stat_buf, "|DSR");
2027 if(!(status & SER_DCD))
2028 strcat(stat_buf, "|CD");
2029
2030 if (info->quot) {
2031 ret += sprintf(buf+ret, " baud:%d",
2032 state->baud_base / info->quot);
2033 }
2034
2035 ret += sprintf(buf+ret, " tx:%d rx:%d",
2036 state->icount.tx, state->icount.rx);
2037
2038 if (state->icount.frame)
2039 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
2040
2041 if (state->icount.parity)
2042 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
2043
2044 if (state->icount.brk)
2045 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
2046
2047 if (state->icount.overrun)
2048 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
2049
2050 /*
2051 * Last thing is the RS-232 status lines
2052 */
2053 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2054 return ret;
2055 }
2056
2057 int rs_read_proc(char *page, char **start, off_t off, int count,
2058 int *eof, void *data)
2059 {
2060 int len = 0, l;
2061 off_t begin = 0;
2062
2063 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
2064 l = line_info(page + len, &rs_table[0]);
2065 len += l;
2066 if (len+begin > off+count)
2067 goto done;
2068 if (len+begin < off) {
2069 begin += len;
2070 len = 0;
2071 }
2072 *eof = 1;
2073 done:
2074 if (off >= len+begin)
2075 return 0;
2076 *start = page + (off-begin);
2077 return ((count < begin+len-off) ? count : begin+len-off);
2078 }
2079
2080 /*
2081 * ---------------------------------------------------------------------
2082 * rs_init() and friends
2083 *
2084 * rs_init() is called at boot-time to initialize the serial driver.
2085 * ---------------------------------------------------------------------
2086 */
2087
2088 /*
2089 * This routine prints out the appropriate serial driver version
2090 * number, and identifies which options were configured into this
2091 * driver.
2092 */
2093 static _INLINE_ void show_serial_version(void)
2094 {
2095 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
2096 }
2097
2098
2099 int register_serial(struct serial_struct *req);
2100 void unregister_serial(int line);
2101
2102
2103 /*
2104 * The serial driver boot-time initialization code!
2105 */
2106 static int __init rs_init(void)
2107 {
2108 unsigned long flags;
2109 struct serial_state * state;
2110
2111 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
2112 return -ENODEV;
2113
2114 /*
2115 * We request SERDAT and SERPER only, because the serial registers are
2116 * too spreaded over the custom register space
2117 */
2118 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
2119 return -EBUSY;
2120
2121 init_bh(SERIAL_BH, do_serial_bh);
2122
2123 IRQ_ports = NULL;
2124
2125 show_serial_version();
2126
2127 /* Initialize the tty_driver structure */
2128
2129 memset(&serial_driver, 0, sizeof(struct tty_driver));
2130 serial_driver.magic = TTY_DRIVER_MAGIC;
2131 serial_driver.driver_name = "amiserial";
2132 serial_driver.name = "ttyS";
2133 serial_driver.major = TTY_MAJOR;
2134 serial_driver.minor_start = 64;
2135 serial_driver.num = 1;
2136 serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
2137 serial_driver.subtype = SERIAL_TYPE_NORMAL;
2138 serial_driver.init_termios = tty_std_termios;
2139 serial_driver.init_termios.c_cflag =
2140 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2141 serial_driver.flags = TTY_DRIVER_REAL_RAW;
2142 serial_driver.refcount = &serial_refcount;
2143 serial_driver.table = serial_table;
2144 serial_driver.termios = serial_termios;
2145 serial_driver.termios_locked = serial_termios_locked;
2146
2147 serial_driver.open = rs_open;
2148 serial_driver.close = rs_close;
2149 serial_driver.write = rs_write;
2150 serial_driver.put_char = rs_put_char;
2151 serial_driver.flush_chars = rs_flush_chars;
2152 serial_driver.write_room = rs_write_room;
2153 serial_driver.chars_in_buffer = rs_chars_in_buffer;
2154 serial_driver.flush_buffer = rs_flush_buffer;
2155 serial_driver.ioctl = rs_ioctl;
2156 serial_driver.throttle = rs_throttle;
2157 serial_driver.unthrottle = rs_unthrottle;
2158 serial_driver.set_termios = rs_set_termios;
2159 serial_driver.stop = rs_stop;
2160 serial_driver.start = rs_start;
2161 serial_driver.hangup = rs_hangup;
2162 serial_driver.break_ctl = rs_break;
2163 serial_driver.send_xchar = rs_send_xchar;
2164 serial_driver.wait_until_sent = rs_wait_until_sent;
2165 serial_driver.read_proc = rs_read_proc;
2166
2167 /*
2168 * The callout device is just like normal device except for
2169 * major number and the subtype code.
2170 */
2171 callout_driver = serial_driver;
2172 callout_driver.name = "cua";
2173 callout_driver.major = TTYAUX_MAJOR;
2174 callout_driver.subtype = SERIAL_TYPE_CALLOUT;
2175 callout_driver.read_proc = 0;
2176 callout_driver.proc_entry = 0;
2177
2178 if (tty_register_driver(&serial_driver))
2179 panic("Couldn't register serial driver\n");
2180 if (tty_register_driver(&callout_driver))
2181 panic("Couldn't register callout driver\n");
2182
2183 state = rs_table;
2184 state->magic = SSTATE_MAGIC;
2185 state->port = (int)&custom.serdatr; /* Just to give it a value */
2186 state->line = 0;
2187 state->custom_divisor = 0;
2188 state->close_delay = 5*HZ/10;
2189 state->closing_wait = 30*HZ;
2190 state->callout_termios = callout_driver.init_termios;
2191 state->normal_termios = serial_driver.init_termios;
2192 state->icount.cts = state->icount.dsr =
2193 state->icount.rng = state->icount.dcd = 0;
2194 state->icount.rx = state->icount.tx = 0;
2195 state->icount.frame = state->icount.parity = 0;
2196 state->icount.overrun = state->icount.brk = 0;
2197 /*
2198 if(state->port && check_region(state->port,REGION_LENGTH(state)))
2199 continue;
2200 */
2201
2202 printk(KERN_INFO "ttyS%02d is the amiga builtin serial port\n",
2203 state->line);
2204
2205 /* Hardware set up */
2206
2207 state->baud_base = amiga_colorclock;
2208 state->xmit_fifo_size = 1;
2209
2210 save_flags (flags);
2211 cli();
2212
2213 /* set ISRs, and then disable the rx interrupts */
2214 request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2215 request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state);
2216
2217 /* turn off Rx and Tx interrupts */
2218 custom.intena = IF_RBF | IF_TBE;
2219 mb();
2220
2221 /* clear any pending interrupt */
2222 custom.intreq = IF_RBF | IF_TBE;
2223 mb();
2224
2225 restore_flags (flags);
2226
2227 /*
2228 * set the appropriate directions for the modem control flags,
2229 * and clear RTS and DTR
2230 */
2231 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2232 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2233
2234 return 0;
2235 }
2236
2237 static __exit void rs_exit(void)
2238 {
2239 unsigned long flags;
2240 int e1, e2;
2241 struct async_struct *info;
2242
2243 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2244 save_flags(flags);
2245 cli();
2246 remove_bh(SERIAL_BH);
2247 if ((e1 = tty_unregister_driver(&serial_driver)))
2248 printk("SERIAL: failed to unregister serial driver (%d)\n",
2249 e1);
2250 if ((e2 = tty_unregister_driver(&callout_driver)))
2251 printk("SERIAL: failed to unregister callout driver (%d)\n",
2252 e2);
2253 restore_flags(flags);
2254
2255 info = rs_table[0].info;
2256 if (info) {
2257 rs_table[0].info = NULL;
2258 kfree(info);
2259 }
2260
2261 if (tmp_buf) {
2262 free_page((unsigned long) tmp_buf);
2263 tmp_buf = NULL;
2264 }
2265
2266 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2267 }
2268
2269 module_init(rs_init)
2270 module_exit(rs_exit)
2271
2272
2273 /*
2274 * ------------------------------------------------------------
2275 * Serial console driver
2276 * ------------------------------------------------------------
2277 */
2278 #ifdef CONFIG_SERIAL_CONSOLE
2279
2280 static void amiga_serial_putc(char c)
2281 {
2282 custom.serdat = (unsigned char)c | 0x100;
2283 while (!(custom.serdatr & 0x2000))
2284 barrier();
2285 }
2286
2287 /*
2288 * Print a string to the serial port trying not to disturb
2289 * any possible real use of the port...
2290 *
2291 * The console must be locked when we get here.
2292 */
2293 static void serial_console_write(struct console *co, const char *s,
2294 unsigned count)
2295 {
2296 unsigned short intena = custom.intenar;
2297
2298 custom.intena = IF_TBE;
2299
2300 while (count--) {
2301 if (*s == '\n')
2302 amiga_serial_putc('\r');
2303 amiga_serial_putc(*s++);
2304 }
2305
2306 custom.intena = IF_SETCLR | (intena & IF_TBE);
2307 }
2308
2309 /*
2310 * Receive character from the serial port
2311 */
2312 static int serial_console_wait_key(struct console *co)
2313 {
2314 unsigned short intena = custom.intenar;
2315 int ch;
2316
2317 custom.intena = IF_RBF;
2318
2319 while (!(custom.intreqr & IF_RBF))
2320 barrier();
2321 ch = custom.serdatr & 0xff;
2322 custom.intreq = IF_RBF;
2323
2324 custom.intena = IF_SETCLR | (intena & IF_RBF);
2325
2326 return ch;
2327 }
2328
2329 static kdev_t serial_console_device(struct console *c)
2330 {
2331 return MKDEV(TTY_MAJOR, 64);
2332 }
2333
2334 static struct console sercons = {
2335 "ttyS",
2336 serial_console_write,
2337 NULL,
2338 serial_console_device,
2339 serial_console_wait_key,
2340 NULL,
2341 NULL,
2342 CON_PRINTBUFFER,
2343 -1,
2344 0,
2345 NULL
2346 };
2347
2348 /*
2349 * Register console.
2350 */
2351 void __init serial_console_init(void)
2352 {
2353 register_console(&sercons);
2354 }
2355 #endif
2356
2357 MODULE_LICENSE("GPL");
2358